Fix comment_to_string edge case
Fix comment_to_string edge case

TBAPI-0KA/NSass,mikebarkas/libsass,FishingCactus/libsass,am11/libsass,errorx666/libsass,panicinc/libsass,TBAPI-0KA/NSass,saper/libsass,TBAPI-0KA/NSass,errorx666/libsass,errorx666/libsass,mikebarkas/libsass,technoAri/libsass,mikebarkas/libsass,technoAri/libsass,TBAPI-0KA/NSass,am11/libsass,khchanel/libsass,khchanel/libsass,errorx666/libsass,mtwebster/mint-libsass,mikebarkas/libsass,am11/libsass,khchanel/libsass,saper/libsass,saper/libsass,mtwebster/mint-libsass,panicinc/libsass,technoAri/libsass,mikebarkas/libsass,saper/libsass,TBAPI-0KA/NSass,FishingCactus/libsass,khchanel/libsass,panicinc/libsass,mtwebster/mint-libsass,mtwebster/mint-libsass,FishingCactus/libsass,TBAPI-0KA/NSass,saper/libsass,FishingCactus/libsass,am11/libsass,panicinc/libsass,panicinc/libsass,am11/libsass,FishingCactus/libsass,mtwebster/mint-libsass,khchanel/libsass,technoAri/libsass,technoAri/libsass